Ok, first they restrict bandwidth to 32 KB per second. That's horrible.
Then they block SMTP. They don't sniff, they block port 25. The reason? So viri that distribute spam are blocked.
If I were a viri writer, I think I would NOT use the default SMTP port because hmm?. IT COULD BE BLOCKED SO EASALY!
I got by the SMTP lock by using port 26 which I guess is the SMTP port mirror.
Third, we need to register our MAC addresses.
At Toledo , they did not block SMTP, did not limit bandwidth (I got 3 mega BYTES per second one morning at 4 AM ), and they did not require MAC address registration; yet they did not have ANY bandwidth or strange network problems. Hmmm?.